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Late Effects of Childhood Cancer Treatment

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Late Effects of Childhood Cancer Treatment cancer.org | 1.800.227.2345 Late Effects of Childhood Cancer Treatment Today, because of advances in treatment, more than 80% of children treated for cancer survive at least 5 years. But the treatments that help these children survive their cancer can also cause health problems later on. Most treatment side effects appear during or just after treatment and go away a short time later. But some problems might not go away or might not show up until months or years after treatment. These problems are called late effects. Because more children with cancer now survive into adulthood, their long-term health and these late effects have become a focus of care and research. Careful follow-up after cancer treatment helps doctors find and treat any late effects as early as possible. The follow-up schedule depends on many things, including the type of cancer the child had, the treatments used, the risk of late effects from those treatments, and other factors such as the patient’s age, amount of chemotherapy or radiation given, and how long it has been since treatment was completed. Will my child be at risk for late effects after cancer treatment? Each child getting cancer treatment is unique. The treatments used vary from child to child and from one type of cancer to another. Other things that can affect a child’s risk include: ● The type of cancer ● Where the cancer was in the body ● How old the child was when treated ● The child’s overall health before the cancer 1 ____________________________________________________________________________________American Cancer Society cancer.org | 1.800.227.2345 ● The child’s genetic make-up (inherited risk for certain health problems) Late effects are caused by the damage that cancer treatment does to healthy cells in the body. Most late effects are caused by chemotherapy or radiation. Major surgery can also lead to late effects. Chemotherapy Chemotherapy (chemo) is the use of drugs to kill cancer cells. But chemo drugs can damage normal cells, too, which can cause short-term and long-term side effects. Chemotherapy damage to quickly dividing cells can cause side effects such as low blood cell counts, nausea, diarrhea, or hair loss during treatment. These short-term side effects usually go away over time after treatment is over. Late effects, on the other hand, may happen many years later. A child’s whole body is growing. This means that many different kinds of healthy, normal cells are dividing faster than they would be in an adult. Some types of chemo drugs can damage these cells and keep them from growing and developing the way they should. Radiation therapy Radiation treatment uses high-energy rays (such as x-rays) to kill cancer cells and shrink tumors. The radiation may come from outside the body (external radiation) or from radioactive materials placed into or right next to the tumor (internal or implant radiation). Radiation is sometimes used along with other treatments, such as before or after surgery, or along with chemo. For some, it may be the main treatment. As with chemo, radiation therapy can affect normal cells as well as cancer cells. Some organs and parts of the body are more likely to be affected by radiation than others. Younger children’s bodies tend to be more sensitive to the effects of radiation. Some children are at greater risk for side effects. For example, children with the hereditary form of retinoblastoma1 (an eye cancer) are more sensitive to the effects of radiation. Surgery Surgery is an important part of treatment for many cancers. As with other types of treatment, the possible long-term effects of surgery depend on a number of different factors. 2 ____________________________________________________________________________________American Cancer Society cancer.org | 1.800.227.2345 In some cases, surgery may be fairly minor and may leave nothing more than a scar. In other situations it may need to be more extensive and require removing part or all of an organ, or even a limb. Doctors do their best to limit the effects of surgery by striking a balance between removing all of the cancer and taking out as little healthy body tissue as possible. Younger children, whose bodies are still actively growing, may be more affected by some operations than older children who are already at or near their full body size. Late effects of childhood cancer treatment on different areas of the body Just as the treatment of childhood cancer requires a very specialized approach, so does aftercare and watching for late effects. Late effects can involve more than one part of the body (or more than one organ system) and can range from mild to severe. Below are some of the more common possible late effects of cancer treatment. This is by no means a complete list, as other late effects can occur as well. If your child is being treated for cancer or if you were treated as a child, it’s important to speak with the health care team to learn more about the possible late effects based on your specific situation. Brain Some treatments used for tumors in the brain2 or to try to prevent cancer from spreading there can cause late effects. Children with brain tumors or with acute lymphocytic (lymphoblastic) leukemia (ALL)3 are most likely to have late effects in the brain, but children with other cancers may be affected as well. Treatments that can affect the brain include surgery, radiation therapy, and chemotherapy. Normal brain cells grow quickly in the first few years of life, making them very sensitive to radiation. Doctors try to avoid using radiation therapy to the head or to postpone it in children younger than 3 years old to limit damage that might affect brain development. But even in older children, radiation may cause problems such as learning disabilities. Doctors try to use as little radiation as possible, but this needs to be balanced with the risk of the cancer growing or returning, as radiation therapy may be lifesaving in some cases. Some types of chemotherapy, given either into a vein (intravenous, or IV chemo) or directly into the spinal column (called intrathecal chemo or “spinal tap chemo”), can also cause learning disabilities in children. This is more likely if higher doses of certain 3 ____________________________________________________________________________________American Cancer Society cancer.org | 1.800.227.2345 chemo drugs are used, and if the child is younger at the time of treatment. Learning disabilities are more common in children who get both chemo and radiation to the brain. Learning problems, often called cognitive impairments, usually show up within a few years of treatment. They may be seen as: ● Lower IQ scores, which can vary depending on the intensity of the treatment ● Lower academic achievement test scores ● Problems with memory and attention ● Poor hand-eye coordination ● Slowed development over time ● Behavior problems Non-verbal skills like math are more likely to be affected than language skills like reading or spelling, but nearly any area of brain development can be affected. Other late effects that may show up, depending on the type of treatment used, include things like seizures and frequent headaches. Treatments that affect the brain can also lead to other effects in the body. For example, radiation therapy can sometimes affect the pituitary gland, which is at the base of the brain and helps control the levels of many hormones in the body. Symptoms of pituitary problems can include fatigue, listlessness, poor appetite, cold intolerance, and constipation, which may point to low levels of certain hormones. Other problems can include delayed growth and/or sexual maturation, which are described below in Treatment effects on growth and development. Eyes Cancer treatment can affect vision in a number of ways. Vision problems after treatment are most common with retinoblastomas, which are childhood cancers that start in the light-sensitive area of the eye (retina). In many cases, the vision in the eye has already been destroyed by the tumor at the time of diagnosis. Surgery may be needed to remove the affected eye. If this is done, a prosthetic (artificial) eye is put in to take the place of the eyeball. Radiation therapy to the eye can sometimes damage inner parts of the eye, which can lead to vision problems. Radiation in the area of the eye can also sometimes cause cataracts (clouding of the lens of the eye) over time. Radiation treatment to the bones near the eye may also slow bone growth, which can change the shape of the child’s 4 ____________________________________________________________________________________American Cancer Society cancer.org | 1.800.227.2345 face as it grows. Pituitary gland tumors4 or their treatment might also affect vision. This gland is very close to the optic nerves, which connect the eyes to the brain. Surgery or radiation in the area might also affect these nerves, which could lead to vision problems. Certain chemo drugs can be toxic to the eye and may lead to problems like blurred vision, double vision, and glaucoma. Many times, these effects go away over time. Children who have had a stem cell transplant may be at higher risk for some eye problems if they develop chronic graft-versus-host-disease. This is a condition in which the new immune system attacks cells in the eye (as well as other cells in the body). Other late effects on the eye may include: ● Dry eyes ● Watery eyes ● Eye irritation (feels like something is in the eye) ● Discolored sclera (white part of the eye) ● Poor vision ● Light sensitivity ● Poor night vision ● Tumors on the eyelid ● Drooping eyelid If cancer treatment might affect eyesight, your child’s vision will be checked during treatment so that, if possible, the treatment plan can be changed if there are signs of vision loss.
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